What Is a Pulsation Dampener?

A pulsation dampener is a pump accessory designed to reduce pressure fluctuations, flow surges, vibration, and hydraulic shock in a fluid-transfer system. When used with an air-operated double diaphragm pump, a pulsation dampener helps smooth the discharge flow created by the natural reciprocating action of the pump.

Because diaphragm pumps operate by alternating suction and discharge strokes, the flow can include pressure pulses. In many applications, those pulses are not a problem. In others, smoother flow and more stable pressure can help protect piping, fittings, valves, filters, meters, spray equipment, and downstream process equipment.

Yamada pulsation dampeners are designed to help reduce these surges and provide a more consistent discharge flow in demanding industrial pumping applications.

How Does a Pulsation Dampener Work?

A pulsation dampener works by absorbing pressure spikes and filling in pressure drops in the discharge line.

As an air-operated diaphragm pump completes each stroke, fluid moves through the discharge side of the pump. This can create a repeating pressure pulse in the piping system. A pulsation dampener provides a cushion that responds to these pressure changes.

When discharge pressure rises, fluid enters the dampener and compresses the air or gas cushion behind the diaphragm. When pressure drops, the compressed cushion pushes fluid back into the discharge line. This action helps smooth out the flow and reduce the sharp pressure changes caused by pump cycling.

In simple terms:

• The pump creates a pressure pulse.
• The dampener absorbs part of that pulse.
• The dampener releases energy back into the line when pressure falls.
• The result is smoother flow and more stable discharge pressure.

Why AODD Pumps Create Pulsation

An air-operated double diaphragm pump is a positive displacement pump. It uses two diaphragms that move back and forth to draw fluid in and push fluid out. This alternating motion is one of the reasons AODD pumps are so useful for difficult fluids, but it can also produce a pulsing discharge pattern.

The amount of pulsation can depend on several factors, including:

• Pump size
• Pump speed
• Air supply pressure
• Discharge pressure
• Fluid viscosity
• Piping layout
• Hose or pipe diameter
• Distance to downstream equipment
• System restrictions
• Valve and fitting arrangement

A pulsation dampener helps manage these pressure changes so the system operates more smoothly.

What Does a Pulsation Dampener Do?

A pulsation dampener helps reduce the effects of pump pulsation in the discharge line. This can improve system performance and reduce stress on connected equipment.

Common benefits include:

• Smoother discharge flow
• Reduced pressure surges
• Less pipe vibration
• Reduced hydraulic shock
• More stable pressure at the point of use
• Improved performance for filters, meters, nozzles, and spray equipment
• Less stress on hoses, fittings, valves, and piping
• Better control in sensitive fluid-transfer applications

For many industrial applications, this can make the entire pumping system easier to control and maintain.

Where Should a Pulsation Dampener Be Installed?

A pulsation dampener is typically installed on the discharge side of the pump, as close to the pump outlet as practical. Placing the dampener close to the pump allows it to respond quickly to pressure fluctuations before those pulses travel farther through the piping system.

The ideal location depends on the pump, piping layout, fluid, pressure, and process requirements. In many systems, installing the dampener near the pump discharge helps reduce vibration and pressure spikes before they reach downstream equipment.

Yamada AD Series Pulsation Dampeners

Yamada AD-10, AD-25, AD-40 and AD-50 Series pulsation dampeners are designed for use with Yamada air-operated double diaphragm pumps. These dampeners help reduce pressure fluctuations and compensate for the voids and pressure changes created by AODD pump operation.

Yamada AD Series dampeners are available for multiple pump sizes and are commonly used in industrial fluid-transfer systems where smoother flow is desired.

Depending on the pump model and application, Yamada AD Series dampeners are available in several sizes, including:

• AD-10
• AD-25
• AD-40
• AD-50

Yamada also offers FDA dampeners for compatible FDA Series pump applications and DP dampeners for high purity pumps where high-purity fluid handling is required.

Applications That May Use a Pulsation Dampener

Pulsation dampeners are used in applications where pressure stability, reduced vibration, or smoother flow is important. They are commonly considered for systems involving:

• Chemical transfer
• Metering or filling support
• Spray applications
• Filter feed
• Filter press support
• Paint and coatings transfer
• Ink transfer
• Food, cosmetic, and pharmaceutical support applications
• High-purity fluid transfer
• Wastewater and sludge transfer
• Oil and lubricant transfer
• Adhesives, sealants, and resin transfer
• Long discharge lines
• Systems with gauges, meters, sensors, or downstream valves

Yamada pumps are used across many industries, including chemical processing, paint and coatings, food, cosmetics and pharmaceutical applications, filter press applications, wastewater and sludge transfer, and general industrial fluid transfer.

Why Smoother Flow Matters

In some applications, a pulsing discharge flow is acceptable. In others, excessive pulsation can create problems throughout the system.

A pulsation dampener may help when a system is experiencing:

• Pressure gauge fluctuation
• Hose movement or pipe vibration
• Inconsistent spray pattern
• Flow meter instability
• Filter housing stress
• Fitting or connection fatigue
• Hydraulic shock
• Noise caused by pressure surges
• Difficulty maintaining consistent downstream pressure

By reducing pressure fluctuations, a dampener can help the system run more steadily and can improve the performance of equipment installed downstream from the pump.

Pulsation Dampener vs. Surge Suppressor

The terms pulsation dampener, pulse dampener, pulsation damper, surge dampener, and surge suppressor are often used in similar ways. In general, these devices are designed to reduce pressure variation in a pumping system.

A pulsation dampener is most commonly used to smooth repeating pressure pulses created by pump operation. A surge suppressor may also be used to describe equipment that reduces larger pressure spikes or hydraulic shock. In many AODD pump systems, the goal is the same: reduce unwanted pressure movement and create a more stable discharge line.

Pulsation Dampener vs. Pulsation Dampener for High Purity Applications

Not all dampener applications are the same. A standard industrial dampener may be suitable for many chemical, coating, wastewater, oil, and general transfer applications. High-purity or sanitary-style processes may require specialized equipment.

Yamada offers DP dampeners for high purity pumps and FDA dampeners for FDA Series pumps for applications where the fluid-handling requirements are different from standard industrial transfer service.

Choosing the Right Pulsation Dampener

Selecting the correct pulsation dampener depends on the pump, fluid, and system conditions. The dampener should be matched to the pump size and application requirements.

Important selection factors include:

• Pump model and port size
• Flow rate
• Discharge pressure
• Fluid viscosity
• Chemical compatibility
• Solids content
• Temperature
• System layout
• Piping or hose size
• Required level of pulsation reduction
• Distance to downstream equipment
• Material compatibility
• Standard, FDA, or high-purity requirements

Yamada can help review your pump model, fluid, operating pressure, and system requirements to recommend a dampener option for your application.

Related Pump Accessories

A pulsation dampener is one of several accessories that can help improve AODD pump system performance. Depending on the application, other accessories may also be useful.

Related Yamada accessories include:

• Filter/regulators for air supply preparation
• Liquid level controllers for level-based pump operation
• Batch controllers for controlled transfer applications
• Diaphragm monitor systems for leak detection support
• Dry run detectors for pump protection support

Learn more about related terminology, including What Is a Filter Regulator?, What Is an Air Valve?, and Understanding Performance Curves.

Frequently Asked Questions About Pulsation Dampeners

What is a pulsation dampener used for?

A pulsation dampener is used to reduce pressure pulses, flow surges, vibration, and hydraulic shock in a pump discharge line. It is commonly used with air-operated double diaphragm pumps to create smoother discharge flow.

Why do diaphragm pumps pulse?

Diaphragm pumps pulse because they use reciprocating diaphragm movement to create suction and discharge flow. As each diaphragm stroke moves fluid, the discharge line can experience repeating pressure changes.

Does a pulsation dampener increase pressure?

A pulsation dampener does not create additional pump pressure. Its purpose is to absorb and smooth pressure fluctuations in the system.

Where should a pulsation dampener be installed?

A pulsation dampener is usually installed on the discharge side of the pump, as close to the pump outlet as practical. The best installation location depends on the pump, piping, fluid, and process requirements.

Do all diaphragm pumps need a pulsation dampener?

No. Not every diaphragm pump application requires a pulsation dampener. A dampener is typically considered when the system needs smoother flow, reduced vibration, more stable pressure, or better protection for downstream equipment.

What is the difference between a pulsation dampener and a surge suppressor?

The terms are sometimes used similarly. A pulsation dampener generally smooths repeating pressure pulses created by pump operation. A surge suppressor may also refer to equipment used to reduce larger pressure spikes or hydraulic shock.

Can a pulsation dampener be used with chemicals?

Yes, a pulsation dampener can be used in chemical transfer systems when the dampener materials are compatible with the fluid being pumped. Material compatibility should always be reviewed before selecting equipment for chemical service.

How do I choose the right pulsation dampener?

Start with the pump model, flow rate, discharge pressure, fluid, viscosity, temperature, chemical compatibility, solids content, and system layout. Yamada can help review these details and recommend a dampener for the application.

Talk to a Pump Expert

Not sure whether your application needs a pulsation dampener? Yamada can help evaluate your pump, fluid, piping layout, discharge pressure, and operating conditions.

Contact Yamada today to speak with a pump expert about pulsation dampeners, AODD pumps, and pump accessories.

The Proof’s in the Pump.